/*
 * Copyright 2008-2009 Sanjay Dwivedi.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.isdinvestments.common.repository;

import java.util.List;
import java.util.Map;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

public class BaseJPARepository {
    @PersistenceContext
    protected EntityManager entityManager;

	public BaseJPARepository() {
		super();
	}
	
	public EntityManager getEntityManager() {
		return entityManager;
	}
	
	public void setEntityManager(EntityManager entityManager) {
		this.entityManager = entityManager;
	}
	/**
	 * Return the persistent entities returned from a named query.
	 */
	protected List findByNamedQuery(String queryName) {
		Query queryObject = entityManager.createNamedQuery(queryName);
		return queryObject.getResultList();
	}
	/**
	 * Return the persistent entities returned from a named query with named parameters.
	 */
	protected List findByNamedQuery(String queryName, Map<String, Object> namedParamsAndValues) {
		if (queryName == null || namedParamsAndValues == null) {
			throw new IllegalArgumentException();
		}
		
		Query queryObject = entityManager.createNamedQuery(queryName);
		for (Map.Entry<String, ?> entry : namedParamsAndValues.entrySet()) {
			queryObject.setParameter(entry.getKey(), entry.getValue());
		}
		
		return queryObject.getResultList();
	}
}
